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New D0OE-R CJ head flow numbers (ported)
March 29 2001 at 10:54 PM
No score for this post Mike R. (no login)
from IP address 4.54.62.25

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Hey guys,
I told some of you a while back I would be porting my D0OE-R heads and getting them flow tested when I was finished. Well it's taken me a while but here are the results of the flow test:

Valve Lift IN EX
.100” - 81.32 57.48
.200” - 156.47 112.24
.300” - 227.34 151.32
.400” - 277.54 175.14
.500” - 310.96 192.43
.600” - 343.36 203.61
.650” - 352.75 206.80
.700” - 362.56 209.52
.800” - 375.24 211.34

I don't own a flowbench. I just ported these the best I could and then got them flow tested. Overall I'm pretty satisfied with the results. It would be nice to somehow have more flow on the exhaust side, but I did the best I could with it. The valves are stock size (2.245" intake and 1.725" exhaust).

I may be testing another set of D0OE-R's that are VERY mildly ported sometime in the future to see what just the basic mods will accomplish.


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Chris C
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208.6.240.153 Thanks man!
No score for this post March 30 2001, 10:25 AM

Looks like excellent nos., I may be wrong but I think stock CJ's max out right at 300cfm, can't remember exhaust side.

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Walt Barnes
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12.36.108.135 How did you port, what does this mean
No score for this post April 6 2001, 4:52 PM

This should start a pretty interesting discussion. First, could you give a brief description of what you did. Second, we all know the exhaust side isn't great, and your numbers are another confirmation. But look how the exhaust flow doesn't improve much with lift above .500. That suggests that the problem is really in the port itself, not the bowl. Right? Does that suggest anything?

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Mike R.
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4.54.200.117 Port work
No score for this post April 7 2001, 12:45 AM

It would be hard to give a brief desription of what I did, but I'll try. On the exhaust side I smoothed the bowls below the valve, removed the emmisions hump completely, reshaped the valve guides to a cone but left a point on the guide to direct the flow and raised the roof and widened the port quite a bit as well a smoothing the short turn radius.

On the intake side I smoothed the bowl, straightened the port entrance where the head bolts humps are, and reduced the large rectangular chunk of metal behind the valve guide as well as reshaping the valve guide to some degree. Also worked on the combustion chambers and got a three angle valve job.

I think the big problem with the exhaust ports on iron heads in general is the bottom side of the port is very low and the port is tall. What tends to happen is the flow on the top of the port comes up and swirls vertically and tries to go back into the port on the bottom side of the port which works against itself somewhat. This is why the edlebrock heads have that bottom part of the port closed off and why port plates are popular.

The stock numbers for these D0OE-R cj heads peak at 280 cfm intake and 147 exhaust, so I have managed to make a pretty strong improvement with peaks of 375 and 211. The unported cj aluminum heads flow around 296/180 so my heads are now also quite a bit more than that. Where the aluminum cj heads ultimately have an advantage is they generally have the potential for about 250 cfm on the exhaust with a radical port job and I think my 211 is just about maxed out without adding some type of port plates or welding the ports.

At any rate these heads should support as much as 800 horsepower (not that I'm going quite that radical). I plan to have a custom ground cam that heavily favors the exhaust to try and help out on that side, but I expect them to do pretty well for iron heads.

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BigD
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24.160.144.58 aluminum cj's
No score for this post April 7 2001, 4:50 AM

Mike I just had my aluminum cj's profesionally ported at a reputable performance shop here in san antonio tx, Intake done at 380 exhaust done at 258. just some helpful info BigD

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Mike R.
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4.54.206.203 aluminum cj's
No score for this post April 7 2001, 10:34 AM

Thanks for the info Big D. Those are strong numbers that should support a ton of horsepower. Most of the ported aluminum cj's seems to flow more around 220 cfm, so that 258 very strong. That's a good port job. Is there any way you could show the full set of numbers throughout the lift ranges. That info would be interesting to see.

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bigd
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24.160.144.58 yes let me dig up the paperwork.......n/m
No score for this post April 7 2001, 11:40 PM

n/m

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BigD
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24.160.144.58 Heres something to think about.............. ported aluminum CJ's
No score for this post April 16 2001, 7:56 PM

Lift Intake Exhaust
.100 82.3 66.1
.200 142.6 122.3
.300 202 176
.400 264 201
.500 319 232
.600 350 254
.650 362 256
.700 370 258
.750 379.7 258

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Walt Barnes
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12.36.108.115 Do you have the unported numbers
No score for this post April 19 2001, 4:50 AM

I don't suppose you have the "before" numbers on the CJ heads do you? I'm making an archive of flow numbers for 385 series heads and knowing the flow numbers at various lifts for the unported aluminum CJs would be great!

Thanks,

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gregaust
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203.17.162.32 alum cj flow no.s unported
No score for this post April 19 2001, 7:01 AM

lift int cfm exh cfm
.050 29.0 23.5
.100 63.4 41.5
.200 120.7 92.0
.300 181.0 133.0
.400 240.0 165.0
.500 274.0 176.0
.600 292.0 181.0
.700 296.0 181.0

these figures are from carcraft june 1999
it would be good to see your list of flow no.s.are they on a website somewhere?
hope these figures help...

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Walt Barnes
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12.36.108.115 Any other numbers???
No score for this post April 19 2001, 4:58 AM

Mike, Do you have similar numbers from the iron CJs before you did you porting. I'm looking for flow at lift nubmers for other 385 series heads.

Thanks.
 

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Exhaust ports

I read an article a couple years back about the exhaust swirl on oval ports and to correct the problem they squared the ports up top and buttom, this was supposed to stop the swirl any thoughts, anyone out there try it. Gregg Zephyrracer
 
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